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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e4dbfa8d672398603d9bafeb08669e587d7ab395c88ec34a729820206f541f4' 
  AND token = '9XQsPiF2xbHfwir++/3WkQPY5u1lHliLaQgLxxXxnR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}